Vise having swivel jaw clamped to base in proportion to clamping pressure on workpiece



Oct. 9, 1951 L. PURPURA 2,570,857 VISE HAVING SWIVEL JAW CLAMPED TO BASEIN PROPORTION TO CLAMPING PRESSURE ON WORKPIECE Filed Nov. 4, 1949 2Sheets-Sheet 1 l2 fiorz'o .Pur ura ATTORNEYQ V INVENTOR 2,570,857OPORTION Oct. 9, 1951 L. PURPURA VISE HAVING SWIVEL JAW CLAMPED TO BASEIN PR TO CLAMPING PRESSURE ON WORKPIECE 2 Sheets-Sheet 2 Filed Nov. 4,1949 INVENTOR I ATIORNEKS g1 Li$orio Purpura Patented Oct. 9, 1951UNITED'STATES PATENT OFFICE.

VISE HAVING SWIVEL JAW CLAMPED TO BASE IN PROPORTION TO CLAMPINGPRESSURE ON WORKPIECE V Liborio Purpura, Wheeling, W. Va. ApplicationNovember 4, 1949, Serial No. 125,501

1 Claim. 1

This invention relates to swivel vise having means to vary the clampinof the swivel jaw to the base in proportion to the pressure exerted onthe work.

A primary object of this invention is to provide a swivel vise which isso constructed and arranged that the swivel jaw will be tightly clampedto the bed or base in proportion to the pressure exerted on the workpiece.

With the above and other objects in view, my invention consists in thearrangement, combination and details of construction disclosed in thedrawings and specification, and then more particularly pointed out inthe appended claim.

In the drawings,

Figure 1 is a plan view partly broken away and in section, of a swivelvise constructed according to an embodiment of this invention,

Figure'2 is a bottom plan view of the vise,

Figure 3 is a longitudinal section taken through the vise,

Figure 4 is an outer end elevation of the vise,

Figure 5 is a perspective view of the swivel jaw,

Figure 6 is a fragmentary sectional view taken on the line 6-6 of Figure2,

Figure '7 is a fragmentary sectional view taken on the line 1-1 ofFigure 1.

Referring to the drawings, the numeral l0 designates generally a bed orbase of substantially rectangular configuration in plan, which hasprojecting from the opposite longitudinal edges thereof pairs of earsformed with elongated openings l3 through which fastening means areadapted to be extended for securing the base ID to a supporting element.I

The base H) has formed at the outer or forward end thereof an upstandingfixed clamping jaw I2 and a plate I4 is fixed to the inner or rear sideof the jaw 2 by fastening means IS. The base I6 is provided with alongitudinally extending opening l6 equally spaced between thelongitudinal edges of the base and a slide member generally designatedas I! is disposed partly within the opening l6 and within a pair oflongitudinally extending parallel guide grooves l8 which are formed inthe lower side of the base Ill.

The slide member I! includes a nut portion 26 having a threaded borethrough which a slide adjusting screw shaft 2| engages. The shaft 2|loosely engages through an opening 22 formed in the forward end of thebase l0, and the forward end of the shaft 2| is provided with an annularhead 23 which engages in a recess 24 formed in the forward end of thebase Ill.

2 A plate or cap 25 normally closes the opening 24. The head 23 providesfor holding the shaft 2| against rearward movement when the slide memberI1 is under pressure from the movable jaw, as will be hereinafterdescribed;

The rear or inner end of the shaft 2| loosely engages through an opening26 provided in the rear portion of the base 16, and a cylindrical collar21 is secured by fastening means 28 tothe shaft 2| and bears against therear end of the base In. The shaft 2| is provided at its rear end with apolygonal head or member 29 which may be engaged by a wrench, handle orother means for effecting rotation of the shaft 2|.

The nut portion 20 has projecting upwardly therefrom a threaded stud 30on which a conical nut 3| is threaded. The conical nut 3| is adapted tobe locked in its adjusted position on the stud 30 by means of one ormore set screws 32 which are threaded through the nut 3| and are adaptedto bear against the upper side of the nut portion 20. r

A swivel or rotary jaw generally designated as 33 is rotatably mountedon the nut 3| and is formed with a conic-a1 opening 34 extendingdownwardly therethrough, within which the nut member 3| is adapted toengage. The jaw 33 is substantially square in plan and has secured tothe outer faces thereof plates 35, 36, 31 and 38. The face plate 35 ispreferably smooth on its outer side, which side is adapted to confrontthe' plate l4, whereas the plate 36 is formed with a knurled or serratedouter side 39. The plate 31 is formed with a longitudinally extendinggroove 40, whereas the plate 38 is formed with at least a pair ofvertically disposed grooves 4|.

The slide member I! also includes a forward pair of elongated slide bars42 engageable in the guide grooves l8, and also includes a pair ofrelatively short slide bars 43 projecting from the opposite or rear end.These bars 42 and 43 provide a means whereby the nut member |9 willbeheld against tilting and also provide a means for frictionallygripping the downwardly facing surfaces of the guide grooves H3 at thetime the work piece is clamped between the jaws I2 and 33.

A disc-shaped plate 44 is secured in the upper end of the jaw 33 bycountersunk fastening members 45.

In the use and operation of this Vise, the base H) is secured bysuitable fastening means passing through the openings l3 and into thebed of a machine or other supportingelement. The Work piece is disposedon the upper side of the base 0 between the jaw l2 and 33. When thescrew shaft 2| is rotated t move the jaw 33 toward the jaw l2, the workpiece will be tightly clamped between the two jaws. In the event thework piece is formed with non-parallel opposite sides, the jaw 33 willswing on the conical nut 3|. As pressure is applied to the work piece,the swivel jaw 33 will be forced downwardly on the nut 3! tofrictionally bind against the upper side of the base In, and at the sametime an upward pressure will be exerted on the nut 3| which will becommunicated through the nut portion 20 to the slide bars 42 and 43.These slide bars will frictionally bind against the under surfaces ofthe grooves I8. H V

I do not mean to confine myself to the exact details of constructionherein disclosed, but claim all variations falling within the purview ofthe appended claim.

What I claim is:

A swivel jaw vise comprising a base formed with an elongated openingtherethrough, a fixed jaw carried by said base adjacent one end of saidopening, a movable .jaw engaging the upper side of the base, saidmovable jaw having an inverted conical passageway extending therethroughfrom top t6 bottom, said base having "gfiide'grooves in the lower sidethereof, said guide grooves extending parallel to said opening, a slideengaging said guide grooves, said slide having "a threaded opening, ascrew shaft rotatably carried by said base and engaging through saidthreaded opening; a threaded stud fixed to and extending upwardly fromsaid slide, passing through said elongated opening, and terminating insaid passageway; an inverted conical nut threaded on said stud andpositioned in said passageway so that the conical surface of the latterengages only the conical surfaceof the nut whereby clamping pressureagainst said movable jaw effects a binding thereof against the upperside of said base and simultaneously efi'ects bindingv of said slide insaid grooves, and said movable jaw comprising a rectangular bodyrotatable on said stud.

LIBORIO PURPURA.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name 7 Date 1,751,329 Hancock Mar. l8, 19302,318,487 Horn, Jr. May 4, 1943 FOREIGN PATENTS Number Country Date171,435 Great Britain Nov. 14, 1921 177,843 Great Britain Apr. 3, 1922

